Exam 11: Single-Slice Spiralhelical Computed Tomography: Physical Principles and Instrumentation

A number of interpolation algorithms are used to produce the planar data set, but linear interpolation is the simplest approach.

What allows the x-ray tube to continuously rotate so that a volume of the patient can be acquired?

The stationary part of the spiral/helical computed tomography scanner consists of: I. front-end memory and computer II. detector electronics III. first-stage high-voltage component

The ideal pitch in spiral/helical computed tomography is 2:1.

Limitations of slice-by-slice sequential computed tomography scanning include: I. longer examination time II. inaccurate generation of three-dimensional images III. possible omitted anatomy because of patient respiration

The x-ray tube and detectors are able to rotate continuously during data collection as a result of slip-ring technology.

The reconstruction increment is also referred to as: I. the reconstruction interval II. reconstruction spacing III. the reconstruction model

Which of the following can eliminate motion artifacts? I. calculation of a planar data set II. increased scan speed III. reconstruction of images

All the following are problems that can occur from data acquisition with spiral geometry except:

The overall goal of single-slice spiral/helical volume computed tomography is to increase the volume coverage speed compared with that of the conventional computed tomography scanner.

All the following are typical scan parameters for spiral/helical computed tomography scanners except:

The pitch ratio is expressed as:

An early pioneer in the development of the technique of volume rendering was Dr. Willi A.Kalender.

What is defined as the distance (in millimeters) that the computed tomography table moves during one revolution of the x-ray tube?

All of the following are requirements for volume scanning except:

Volume computed tomography can also be referred to as: I. spiral computed tomography II. helical computed tomography III. circular computed tomography

Volume coverage for fixed scan time and fixed slice thickness can be expressed as:

Table increment and pitch are directly proportional.

Pitch affects both image quality and patient dose.

The rotating part of the spiral/helical computed tomography scanner consists of: I. x-ray tube II. high-voltage generator III. detectors